Help with these 3 questions please

Question 12 Not yet saved Marked out of 1.00 There are many assets available for investment. Each annual return on each asset is a random variable with expected value 10% and standard deviation of returns 20%. The returns are independent. Joe would like to invest in a diversified portfolio of 15 assets, where the an equal sum is invested in each asset. Flag question 7 What would be the standard deviation of the return on this diversified portfolio? Provide your answer as a percentage accurate to two decimals (e.g. 6.73%), but without any percentage sign. Answer: Eloise is going to invest $1000 at time t = 0. This money will be invested for 30 years. The rate of interest earned in any year is variable. Let | denote the investment return in year t. These rates are independent and identically distributed with Pr(1+) = 3% is 0.80 Pr(1) = 4% is 0.20 What is the probability that Eloise's account balance at the end of 30 years will exceed $2500? Please enter your answer accurate to 5 decimal places. Answer: - in 99+ Referring to the previous question: What is the expected value of Eloise's wealth at the end of 30 years? Please enter your answer rounded to the nearest dollar, but without any dollars signs or commas